What is currently the best method to log somewhereto the cloud?
Should we use the crash reports from HockeyApp also in our production environment?
Is it correct, that right now HockeyApp should not be used as a logging plattform, because the custom event feature is no suitable for log-entries (it is limited by unique events per week and it's not possible for example to show all the entries from a specific user ordered by Date)?

Answers

Visual Studio Mobile Center is the next generation technology that combined both Xamarin Test Cloud, HockeyApp and so many things. You can do the following things in Visual Studio Mobile Center:

Build your apps automatically with every pull request

Test apps on thousands of real-world devices

Distribute passing builds to beta testers

Monitor apps for crashes and bugs

Learn about real world usage with mobile analytics

Connect to a mobile backend for automatic scaling and to add important cloud services like offline data sync, tabular data storage, and end-user authentication services

Visual Studio Mobile Center is currently in preview and you can try it in your app with a trial account that will give access to limited set of all features and gives you a clear idea.

Btw, Xamarin Insights is an analytics tool that answers vital questions about the health of your apps and provides comprehensive details on what kind of users you have and how they interact with your application